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  <a name="EN-US_TOPIC_0000002164606242"></a><a name="EN-US_TOPIC_0000002164606242"></a>
  <h1 class="topictitle1">After a VM Disk Is Overwritten for Restoration, Service Data Is Abnormal After the Restoration Is Complete</h1>
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   <div class="section" id="EN-US_TOPIC_0000002164606242__section152112481487">
    <h4 class="sectiontitle">Symptom</h4>
    <p id="EN-US_TOPIC_0000002164606242__p1653019539483">After a VM disk is overwritten for restoration, service data is abnormal after the restoration is complete.</p>
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    <h4 class="sectiontitle">Possible Cause</h4>
    <p id="EN-US_TOPIC_0000002164606242__p1850394411618">When a disk is overwritten for restoration, the bus type of the original disk is different from that of the target disk. As a result, the disk device name changes after the restoration. For example, after data of a disk using the SCSI bus type is restored to a disk using the VIRTIO bus type, disk device <span class="parmvalue" id="EN-US_TOPIC_0000002164606242__parmvalue39131814201217"><b>/dev/sdb</b></span> changes to <span class="parmvalue" id="EN-US_TOPIC_0000002164606242__parmvalue1457481715129"><b>/dev/vdb</b></span>. As a result, the service data that references the original disk device name is abnormal.</p>
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    <h4 class="sectiontitle">Troubleshooting</h4>
    <ul id="EN-US_TOPIC_0000002164606242__ul2712145841610">
     <li id="EN-US_TOPIC_0000002164606242__li1762615501713">Method 1: Restore the entire VM.</li>
     <li id="EN-US_TOPIC_0000002164606242__li164261326152515">Method 2: Update the name of the disk device used by the service.<p id="EN-US_TOPIC_0000002164606242__p1396122892510"><a name="EN-US_TOPIC_0000002164606242__li164261326152515"></a><a name="li164261326152515"></a>For example, in the <span class="filepath" id="EN-US_TOPIC_0000002164606242__filepath125431214172511"><b>/etc/fstab</b></span> configuration file, the name of the originally mounted disk is <span class="parmvalue" id="EN-US_TOPIC_0000002164606242__parmvalue16543914142513"><b>/dev/sdb</b></span>. After the restoration, change the name to <span class="parmvalue" id="EN-US_TOPIC_0000002164606242__parmvalue3543614192515"><b>/dev/vdb</b></span>.</p> <p id="EN-US_TOPIC_0000002164606242__p14566171716255"><span><img id="EN-US_TOPIC_0000002164606242__image183281119255" src="en-us_image_0000002164766186.png"></span></p></li>
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